Updated ZIP file signature to allow for reported sizes of -1

src/binwalk/magic/archives

@@ -38,10 +38,11 @@
 >4      byte        0x2d
 >>30    ubelong     !0x6d696d65     at least v3.0 to extract,
 >18     lelong      !0
->>18    ulelong      x              compressed size: %d,
->>18    ulelong      x              {jump:%d}
+>>18    lelong      x              compressed size: %d,
+>>18    ulelong	    !0xFFFFFFFF
+>>>18   ulelong     x              {jump:%d}
 >22     lelong      !0
->>22    ulelong     x               uncompressed size: %d,
+>>22    lelong     x               uncompressed size: %d,
 >30     byte        <0x2D           {invalid}
 >30     byte        >0x7A           {invalid}
 >26     leshort     x               {strlen:%d}